[Turbofan] Don't inline if we never saw a function.

src/feedback-vector.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/feedback-vector.h"
 #include "src/code-stubs.h"
 #include "src/feedback-vector-inl.h"
 #include "src/ic/ic-inl.h"
 #include "src/ic/ic-state.h"
 #include "src/objects.h"
@@ skipping 573 matching lines @@
 int CallICNexus::ExtractCallCount() {
   Object* call_count = GetFeedbackExtra();
   CHECK(call_count->IsSmi());
   int value = Smi::cast(call_count)->value();
   return value;
 }
 
 float CallICNexus::ComputeCallFrequency() {
   double const invocation_count = vector()->invocation_count();
   double const call_count = ExtractCallCount();
+  if (invocation_count == 0) {
+    // Prevent division by 0.
+    return 0.0f;
+  }
   return static_cast<float>(call_count / invocation_count);
 }
 
 void CallICNexus::ConfigureUninitialized() {
   Isolate* isolate = GetIsolate();
   SetFeedback(*FeedbackVector::UninitializedSentinel(isolate),
               SKIP_WRITE_BARRIER);
   SetFeedbackExtra(Smi::kZero, SKIP_WRITE_BARRIER);
 }
 
@@ skipping 410 matching lines @@
 void StoreDataPropertyInLiteralICNexus::ConfigureMonomorphic(
     Handle<Name> name, Handle<Map> receiver_map) {
   Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map);
 
   SetFeedback(*cell);
   SetFeedbackExtra(*name);
 }
 
 }  // namespace internal
 }  // namespace v8